62 



(yhapriKiii. and Prifcluird 



closely conjoined by im smaller and narrow tritor which extends 

 to the oral marpfin. Posterior tritor elongate^subquadrate, tend- 

 ings posteriorly to subdivide lineally. The fifth tritor lies behind 

 the symphysial facette, and is narrow, lonof-elliptical, and follows 

 the curve of the lower border. Symphysial fajcette slightly 

 longer than one-third the entire length of the lower border. 



Palatine teeth (nearly always imperfect) relatively broad, and 

 showing the presence of three tritors, the hinder and inner one 

 being very much larger than the remaining two, and generally 

 fully twice the length and breadth of the next largest tritor. 

 Structure of the tritors similarly tubulajte to those of the man- 

 dibular, but coarser. This may account for their usually more 

 decomposed condition in the fossil state. 



Vomerine teeth narrow ; inner symphysial siu-face concave, 

 and furnished with a usually large number of elongated tritors, 

 ranging from 7 to 24. Tritors of the symphysial margin largest, 

 elongate towards the front, whilst in the oral margin they are 

 more numerous, and broken into an imbricated succession. Tri- 

 tors with a very finely tubulated structure. 



Dimensions. — Approximate, on account of worn condition of 

 teeth. 



Mandibular Teeth. 



Spec. a. (tyiJe) - 

 Spec. b. 



Palatine Tooth. 



(Pigcl. spec, imperfect) 



Vomerine Teeth. 



Greatest 

 Tliicluiess. 



17 



16 



16 



Greatest 

 Thickness. 



Spec. a. - - - 71 - 29 - 12 



Spec. b. (imperfect) - 43 - 12 - 10 



Spec. c. (imi^erft'ct) - 37 - 20 - 10 



Spec. d. - - - 34 - 14 - (i 



Locality and Horizon. — Grange Burn, near Hamilton. Western 

 Victoria horn the nodule bed at the base of the Kaliuinan 

 (Nat. Mu.s. Coll., pres. A. A. Kelley ; also F. Spry Coll., (J. Sweet 

 Coll., and G. 1>. Pritcliard Coll.), P>eaumaris, Port Phillip, base of 

 the Kalimnan (Nat. Mus. Coll., pres. by the late W. B. Jennings, 

 and Goll. by the late W. Kershanv ; also G. B. Prit<.^hard Coll.). 



